#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
void find(string in,string after)
{
if(in.size()>0)
{
#include<cstring>
#include<cstdio>
using namespace std;
void find(string in,string after)
{
if(in.size()>0)
{
char ch=after[after.size()-1];
cout<<ch; ///最后一个是根节点；
int k=in.find(ch);
cout<<ch; ///最后一个是根节点；
int k=in.find(ch);
find(in.substr(0,k),after.substr(0,k));
find(in.substr(k+1),after.substr(k,in.size()-k-1)); ///循环输出每一个分支的根节点；
}
}
int main()
{
string in,after;
cin>>in;
cin>>after;
find(in,after);
return 0;
}
find(in.substr(k+1),after.substr(k,in.size()-k-1)); ///循环输出每一个分支的根节点；
}
}
int main()
{
string in,after;
cin>>in;
cin>>after;
find(in,after);
return 0;
}